Review on Mini 3 Digital LED Voltmeter: Accurate DC 2.5-30V Red Volt Voltage Meter for Measuring Power by Rob Clark

I bought this meter to check the voltage of the 18650 and 14500 size Li-ion batteries I use in LED flashlights cheaply and quickly and it works great for this application. However, it requires at least 2.5V to operate, so it cannot be used for heavily drained lithium-ion, NiMH, or alkaline batteries. I've also thought about putting ferrules on the meter wires, which are easier to attach to battery terminals than bare wires, but haven't gotten my hands on that yet.